Furnace cover



Jan. 27, 1925.

C. E. HAWKE FURNACE COVER Filed Nov. 21, 192:5

%A Ce lglENToR Patented Jan. 27, 1925.

UNITED STATES PATENT OFFICE.

CLARENCE E. HAWKE, F METUCHEN, NEW JERSEY, ASSIGNOR TO THE CARBORUN- DUM COMPANY, OF NIAGARA FALLS, NEW YORK, A CORPORATION OF PENNSYL- VANIA.

FURNACE COVER.

To aZZwhom it may concern:

Be it known that I, CLARENCE E. HAWKE, a citizen of the. United States, residing at Metuchen, county of Middlesex, and State 6 of New Jersey, have invented a new and useful Improve ent in Furnace Covers, of which the follow' g is a full, clear, and exact description.

The present invention relates broadly to 11 furnace covers, and more particularly to covers for pits of fuel fired crucible furnaces such as are employed in the melting of brass.

Ithas been the practice heretofore to con- 16 struct the cover of a brass melting furnace from fireclay with a hole at the center of the cover for the escape of the furnace gases. A cover of this character usually burns out first around the central hole. Attempts have been made to overcome this effect by making such covers out of refractory ma terial other than fireclay, such as silicon carbide. While the refractorv qualities of silicon carbide for this purpose were found satisfactory, in that covers made therefrom did not burn out around the central holes, such covers had a comparatively short life due to disastrous cracking resulting from the greater heating thereof at their central portions.

1 haye discovered that this cracking trouble can be overcome by constructing a cover with the central portion thereof formed separate from the outer portion, the latter preferably being made in the form of a sectional ring.

In the accompanying drawings, there is shown, for purposes of illustration only, one embodiment of my invention, it being understood that the drawings do not define the limits of the invention, as changes may be made in the construction therein disclosed without departing from the s irit of the invention or. scope of my roader claims. I

In the drawings:

Figure 1 is a plan view, partly broken away, of a furnace cover constructed in accordance with my invention;

Figure 2 is a sectional view on the line 11-11 of Figure 1;

Figure 3 is a fragmentary sectional view on-the line III-.-III'/,of Figure 1; and

preferably of circular form,

Application filed November 21, 1923. Serial No. 676,070.

Figure 4 is a perspective view of the central section or plug.

Referring to the drawings, my improved cover comprises a central section or plug 2, surrounded by an outer ring 3. The central section is provided with the usual opening 4 at the center thereof for the escape of the furnace gases and with a rabbeted peripheral edge portion 5 for lapping engagement with the similarly rabbeted portion 6 of the outer ring.

The outer ring is preferably made in a number of parts. As shown in the drawings, the ring is made in four equal parts,

each part being provided at one end with a tongue 7 and at its other end with a oove 8, whereby the parts may be joined enaging the tongue on the end of each part in t e'groove in the adjacent end of the adjoining part. The outer sectional ring is provided in its outer peripheral edge with a groove 9 adapted to receive a metal clamp-' ing ring 10 for holding the parts of the ring 3 together. I

I prefer to make both the central section or plug 2 and the outer ring 3 of silicon carbide, as actual experience has demonstrated that a cover of this character has a life many times that of a solid fireclay cover and in excess of that of a solid silicon carbide cover. On the other hand, a cover having the central section or plug of silicon carbide and the outer rinr of fireclay may be einployed with advantage over a solid fireclay cover.

Constructing the cover with the central portion separate from the outer portion has the further advantage. that it enables the central section, which is the first to burn out, to be replaced a number of times before the outer ring has to be discarded.

' Still another advantage of forming the central portion of the cover separate from the outer portion is that it enables the central portion of the cover, which is subjected to a relatively larger amount of heating than the outer portion, to be made of greater thickness than the outer portion.

I claim:

1. A furnace cover, comprising an inner section of opening therethrough for the escape of furnace ases, an outer section of refractory materlal surrounding said inner section and refractorv material having an made in a plurality of separable parts, and means for clampmg said parts together substantially as described.

2. A furnace cover, com rising a circular inner section of silicon car ide, and an outer ring of refractory material, said outer ring being made in a plurality of parts joined toether by a ton ue and groove connection between the ad'oining ends thereof, substantially as described.

3. A furnace cover, comprising an inner removable section of refractory material and an outersect-ion of refractory material "surrounding said inner section and formed in a plurality of separable parts, the adjoining ends of which have interlocking engagement, substantially as described. 4. A furnace cover, comprising a circular inner section of refractory material, an outer ringof refractory material surrounding said inner section and formed in a plurality of separable parts, said ring having a groove in its outer periphery, and clamping means positioned in, said groove "and holdin said parts together, substantially as descri ed.

In testimony whereof 'I have hereunto set my hand.

CLARENCE E. HA'WKE. 

